Window jack



Nov. 17, 1942. w. P. OHARA 2,302,344

WINDOW JACK Filed July 9, 1942 Patented Nov. 17, 1942 UNITED S PATE rice 8 Claims.

This invention relates to a window jack.

An object of the invention is the construction of a window jack that insures safety to the user, while the jack is durable in construction and "comparatively simple to operate.

Another object of the invention is the Vconstruction of a window jack which can be safely fastened to a steel sash, double-hung windows, French sash, monitors, and saw tooth roofs or walls.

A further object of the invention is the construction of an efcient and noval jack which can be used to scaffold up a factory building by starting at the ground floor with a certain length of conduit on end, fitting the jack, and then using another length on the jack to contact with a jack higher up on the building, whereby a scaffolding can be easily produced which .will allow a glazier to start at the top of the building, whereby when the top section is finished it will only be necessary to drop a plank down to the next row of jacks without letting it clown to the floor.

With the foregoing and other objects in View,

my invention comprises certain novel constructions, combinations, and arrangements of parts as will be hereinafter fully described, illustrated in the accompanying drawing, and more particularly pointed out in the appended clairns.

In the drawing:

Figure l is a perspective view of a window jack constructed in accordance with the present invention.

Figure 2 is a vertical longitudinal sectional view of the window jack, taken on line 2--2, Figure 1 and looking in the direction of the arrows.

Figure 3 is partly a plan and partly a horizontal section of the window jack.

Figure 4 is a View taken on line lli-ll, Figure 2 and looking in the direction of the arrows.

Figure 5 is a View taken on line 5 5, Figure 2, and looking in the direction of the arrows.

Referring to the drawing by numerals, I designates the frame of the apparatus, which yfrarne is provided on its outer end with a vertical tube Il. The tube II is preferably welded to the end of the tube 5. The upper end of leg 3 engages the vertical shoring tube II. Horizontal bolts I2 and I3 are provided; the shoring unit I4 rests at its lower end upon bolt I2, Whereas the upper end of shoring unit I5 bears against the bolt I3, Fig. 2, whereby a space is provided between said bolts for free rotation of a draw rod E5.

The draw rod I6 extends into the primary tube 5 (Fig. 2) and is screwed into a steel unit Il. A block I8 is mounted in the tube 5, through which draw rod I6 is adapted to slide. A coil spring I9 is mounted on rod I5 and a block 29 is fastened by set screw 2| onto draw rods I6. The coil spring I9 is capable of exerting a forward push on block 29 when the tail nut 22 is loosened on the outer end of the draw rods I6. ln other words when the tail nut 22 is rotated in one direction, it threads inwardly upon rod l pulling the rod outwardly upon the tube 5,

`whereby spring I9 is compressed. When the tail nut 22 is rotated, to cause it to move outwardly upon rod I6, spring I9 will ytend to force oating raw rod I5 inwardly. Nut 23 is used to screw rod I6 into unit I l against semimircular plate 24, locking plate 24 in its position. Plate 24 slides in slots 25 formed in the sides of the primary tube 5. On the ends of the semi-circular plate 24 are hooks 25.

A large sill-engaging hook 21 extends into tube 5. This hook 21 has a large end 28 that is is a one piece channel steel including leg 2 and,

leg 3 and base 4. The upper ends lof legs and 3 are bolted (as at Gb) to brackets la welded to the primary horizontal square tube 5. A square base tube (square in cross section) is welded to base 4. This base tube 6 is provided at one end with a horizontal slot 'I into which T-shaped cross head 8 extends, when at its innermost position, so that the front face of said head will be flush with the outer face of leg 2V (see Fig. 1). The cross head 8 is lixedly secured to sliding tube 9; this tube 9 is held in an adjusted position by tightening winged set screw ii) upon the top of said tube 9.

The primary tube 5, square in cross section,

fastened to steel unit Il. Therefore, when draw rod I6 is moved outwardly, by rotating .ail nut 22, hook 2l will be caused to tightly engage sill V29 (dotted lines Fig. 2).

A primary cross head 3,!! is against the under face of primary tube 5. This cross head 3! is provided with parallel upstanding flanges 3l; these flanges slidably engage the sides of the primary tube 5 (Fig. 5). Near the outer end of cross head 3l) are upstanding hooks 32. Two chains 33 are provided. Each chain permanently fastened at one end preferably to the lower end of ho-sk 25. and then the chain is passed around hook 32 and then necked over the top end of hook 25, as clearly seen in Figure l.. Therefore, when the apparatus is placed In position `upon the building, the operator adjusts the primary cross head against a portion of the building, then tail nut is rotated to cause. not only the tight tting of hook 2'! upon sill 29 but also the tight tting of the cross 32), by reason of the chains being drawn taut through the action of the draw rod l5 on the steel unit El and semi-circular plate 213. To further secure the cross head 3i) in position, a cap screw or bolt 34 is placed through registering apertures in tube 5, and a nut 35 is placed on the bolt 34, as seen in Figure 2.

An auxiliary cross head 36 is slidably mounted on the primary tube 5. This auxiliary cross head is provided with depending anges 3'1 (Fig. 4) that slide against the side faces of the primary tube 5. A slot 38 is formed in the top of the cross head 36. A cap screw or bolt 39 is placed in said slot 38 and extends through registering apertures in the primary tube 5. A nut 40 is placed on screw or bolt 39 to secure it in position. By loosening somewhat bolt 39 a sliding adjustment of cross head 3G can be obtained upon tube 5. The registering apertures 4I of tube permit adjustment of cross heads 30 and 3B upon the primary tube 5, and by placing the bolts 34 and 39 in diiferent registering apertures 4I, and tightening these bolts, the cross heads can be held in adjusted positions.

Cap screws or bolts 34 and 39 are positioned in a slot 42 formed in hook 27, whereby the hook is permitted to slide within tube 5 for adjustment upon the sill 29.

In the outer end of base tube may be placed a tubing 43 for supporting a plank. On the outer end of tubing 43 is a hook ld to which is secured one end of chain 45. The upper end of chain 45 is fastened by hook 45 to the leg 3.

It is to be understood that the tube Il and the units I4 and I5 are employed for shoring up from the ground if the operator wishes, to scaffold up a whole factory building. The shoring unit I4 is about 6 feet long and will be the next shore up to the next row of jacks and so on up.

While I have described the preferred embodiment of my invention and illustrated the same in the accompanying drawing, certain minor changes or alterations may appear to one skilled in the art to which this invention relates, during the extensive manufacture of the same, and I, therefore, reserve the right to make such altera.- tions or changes as shall fairly fall within the scope of the appended claims.

What I claim is:

1. In a window jack, the combination of a frame provided with a lower portion and an upper portion, said lower portion including a tube having horizontal slots in its inner end, a T-shape cross head slidably mounted on said tube, the horizontal portion of said T-shape head being adapted to slide into said horizontal slots, a cross head slidably mounted on the upper portion of said frame, said frame provided with an extension, and a third cross head slidably mounted on said extension.

2. In a window jack, the combination of a frame provided with a tube, a draw rod provided with a projecting plate slidably mounted in said tube, a sill-engaging hook slidably mounted on said tube and operably connected to said draw rod, cross heads movably mounted upon said frame, and means connecting one of said cross heads to said plate outside of said tube.

3. In a window jack, the combination of a frame provided with a tube, a draw rod mounted in said tube, a sill hook connected to one end of said draw rod, a plate, and means connecting said plate to said draw rod, said plate extending beyond the sides of said tube, a primary cross head engaging said tube and provided with upstanding hooks, chains mounted upon said hooks and connected to said plate, an auxiliary cross head below said chains, and means supporting said cross heads operably connected to said tube.

4. In a window jack, the combination of a frame provided with a horizontal primary tube, said tube provided at its outer end with a vertical tube, said vertical tube being provided with spaced bolts registering with the outer end of said tube, a draw rod extending between said bolts and into said tube, a tail nut and a lock nut threaded on said draw rod contiguous to said vertical tube, a block in said primary tube and against said vertical tube, said draw rod extending through said block, a second block in said tube and fixedly secured to said draw rod, a coil spring on said draw rod between said blocks, a steel unit in said primary tube and connected to the inner end of said draw rod, a sill hook extending from the outer end of said primary tube and connected to said steel unit, said primary tube provided with slots in its sides, a semicircular plate extending through said slots and steel unit and beyond the side faces of said primary tube, said semi-circular plate provided with hooks near its ends, a primary cross head adjustably engaging said primary tube, means for holding said primary cross head in a fixed position upon said primary tube, said primary cross head provided with hooks, chains passing around the hooks of said primary cross head, one end of said chains iixedly secured to the hooks on said semi-circular plate, and portions of said chains detachably secured to said hooks of said semi-circular plate.

5. In a window jack, the combination of a frame including a horizontal tube, a sill-engaging hook and a cross head on said tube, a plate extending into said tube, means connecting said plate exteriorly of the tube to said cross head, and manually-operated means extending into said tube and operably connected to said plate, whereby when the plate is moved upon said tube movement will be imparted to said sill-engaging hook and cross head.

6. In a window jack, the combination of a frame provided with an upper and a lower tube, an adjustable sill-engaging hook extending from the inner end of said tube, an adjustable cross head on said upper tube, a bodily movable cross head on the lower face of said tube, an adjustable cross head on said lower tube, means for locking said adjustable cross head upon said lower tube, and means whereby said last-mentioned cross head is permitted to close upon one end of said lower tube ush with the inner face of said frame.

7. In a window jack, the combination of a frame provided with a base hollow tube, a tube provided with a cross head slidably mounted in one end of said base tube, a plank-supporting tube in the other end of said base tube, a iiexible unit, means connecting said exible unit to the outer end of said plank-supporting tube and to said frame, and said frame being provided with a sill-engaging hook.

8. In a window jack, the combination of a frame structure including a vertical tube, horizontal bolts extending through said vertical tube, cross head operating means between said bolts, shoring units extending into said vertical tube and having their inner ends bearing against said bolts, and said frame being provided with a sill engaging hook.

WILLIAM PATRICK OHARA. 

